xlwings结合dataframe数据的写入

一、代码

import xlwings as xw
import pandas as pd

xl_path=r'***'
df_path=r'***'

df=pd.read_excel(df_path)
app=xw.App(visible=False,add_book=False)

#不弹出提示窗
app.display_alerts=False

load_wb=app.books.open(xl_path)
load_ws=load_wb.sheets["sheetname"]

#清除sheet内的所有数据
load_ws.clear()

#将dataframe转成列表写入
load_ws.range('A1').expand('table').value = df.values.tolist()

load_wb.save()
load_wb.close()
app.quit()

二、改进封装代码

import xlwings as xw
import pandas as pd
import numpy as np

class PathError(BaseException):
    def __init__(self, error):
        self.error = error

class WriteError(BaseException):
    def __init__(self, error):
        self.error = error

# 判断元素是否为数字
def is_number(s):
    try:
        if np.isnan(s) or s == False or s == True:
            return False
    except Exception:
        pass
    try:
        # 判断是否为浮点数
        float(s)
        return True
    except Exception:
        pass
    try:
        import unicodedata  # 处理ASCii码的包
        # 把一个表示数字的字符串转换为浮点数返回的函数
        unicodedata.numeric(s)
        return True
    except (TypeError, ValueError):
        pass
    return False

class ExcelMerge(object):
    def __init__(self):
        self.app = xw.App(visible=False, add_book=False)
        self.app.display_alerts = False
        self.load_wb = None
        self.load_ws = None
        self.data_list = []

    def merge(self, master_path=None, retinue_path=None, sheet=0):
        if not master_path or not retinue_path:
            raise PathError("文件地址不能为空")

        self.data_list = self.read_df(master_path)
        self.data_list.extend(self.read_df(retinue_path))
        self.data_list = pd.DataFrame(self.data_list)
        try:
            self.load_wb = self.app.books.open(master_path)
            self.load_ws = self.load_wb.sheets[sheet]
            self.load_ws.range('A2').expand('table').value = self.data_list
        except Exception as e:
            raise WriteError("excel写入错误：{}".format(e))
        finally:
            self.load_wb.save()
            self.load_wb.close()
            self.app.quit()

    def read_df(self, path):
        df = pd.read_excel(path)
        col_list = []
        # 以下代码是解决纯数字过长导致写入excel后几位变0
        for column in df:
            for v in df[column]:
                if is_number(v):
                    if len(str(v)) > 12:
                        col_list.append(column)
                        break
        if col_list:
            for c in col_list:
                df[c] = df[c].map(lambda x: "'" + str(x) if not pd.isnull(x) else "")

        return df.values.tolist()

em=ExcelMerge()

if __name__ == '__main__':
    # 合并2个excel，一个主表，一个从表
    master_path="****"
    retinue_path="****"
    em.merge()